What is CVE-2019-12830?

CVE-2019-12830 is a high-severity vulnerability in Mybb, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2019-06-15.

How severe is CVE-2019-12830?

High severity. CVSS v3 base score is 8.7 out of 10.

XSS in Mybb

CVE-2019-12830

In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post renderer that leads to [video] BBCode persistent XSS to take over any forum account, aka a nested video MyCode issue.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.010 (58.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

Affected products

Mybb
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org (Exploit, x_refsource_MISC, Vendor Advisory)
cve@mitre.org (Third Party Advisory, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2019-12830?: CVE-2019-12830 is a high-severity vulnerability in Mybb, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2019-06-15.
How severe is CVE-2019-12830?: High severity. CVSS v3 base score is 8.7 out of 10.